Typewriting machine



March 14, 1939. .1. w. MILES TYPEWRITING MACHINE Filed sept. 24, 1956 4 sheets-sheet 1 mw ww March 14, 1939. J. w. MILES TYPEWRITING MACHINE Filed Sept. 24, 1936 4 Sheets-Sheet 2 lN'vENTR ZW ORNEY March 14, 1939. 1 w MILES TYPEWRITING MACHINE Filed Sept. 24, 1936 4 Sheets-Sheet 3 INVENTOR ATTORNEY J. w. MILES March 14, 1939.

TYPEWRITING MACHINE Filed Sept. 24, 1956 4 Sheets-Sheet 4 INVENTOR /j/vw ATTORNEY Patented Mar. 14, 1939 Joseph william mlesehadweli Heath, England,

assignor to' International Business Machines v Corporation, New 1ark, N. Y., a corporation of New York Application septemiem, 193s, serial 10,102,261

-In Great Britain October 9, 1935 s claims. (ci. 19t-133) The present invention relates to fan fold billing devices for typewriters and is concerned with means applicable thereto to enable the use therein of continuous or fan fold stationery, that is, long continuous strips of paper interleaved with short `strips of carbon paper intended for the production of sets of manifold copies of forms, such as accounts, statements, invoices, each set comprising a top typewritten-ribbon copy and a plurality of carbon copies. The means above referred to is designed to be particularly applicable to high speed power-operated typewriters in which every movement in the production of finished invoices, statements, and the like, take place in the minimum 15 possible time.

A11 important requirement in a typewriter intended for use with continuous or fan fold stationery is that the platen may be easily and quickly raised from typing position to a position in which the fan fold or continuous stationery', including carbon sheets, lying therebeneath can be freely moved, adjusted, and arranged, f or example, tostrip the carbon sheet from a finished form, and that the platen may be equally quickly 5 and easily lowered from its elevated position to quately locked against unwanted movement.

In accordance with the present invention there is provided for use with a typewriter a platen- 30 raising device comprising an upward extension at each end of the typewriter carriage, means for permitting the platen to be slid substantially vertically between said extensions, and means for releasably maintaining the platen in a raised 35 or non-typing position. Further, in accordance with the invention, a paper bail is provided adapted to bear resiliently against the platen when the latter is in typing position. There is effect, one embodiment of the same will now be f 50 described with reference to the acompanylng drawings, in which:

Figure 1 is a side-elevational. view of a typewriter having the platen raising and continuous stationery supporting devices of the present in- 56 vention applied thereto;

typing position in which position it shall be ade-- Figure 2 is a plan view of the apparatus shown Figure 3 is a side-elevational view, to a larger scale, of the platen raising mechanism appearing in Figure 1, with the platen in its raised or 5 non-typing position;

Figure 4 is a view similar to Figure 3, but showing the platen in its lower or typing position;

Figure 5 is a front elevation of the platen raising mechanism. 'lo

Figure 6 is a large scale View of certain parts shown in Fig. 1.

Figure 7 is a large scale vertical section showing the construction of the carbon strip holder;

Figure 8 is a large -scale pian View o`f one end 15 of the carbon strip holder.

The drawings' show how the present invention is attached to the well known International power operated typewriter, formerly known as the Electromatic, but the invention may easily be used with other typewritersv as well as with the one shown, whether theybe manually or power operated.

y Referring now to Figures 1 and 2 of the drawings, the typewriter I, of which only the rear pori 5 tion is seen in the drawings, is mounted upon a base which consists of two sheet metal base strips 2 integrally joined by an angle strip 2a which extends parallel with the rear part of the base of the typewriter. The strips 2 and angle 30 strip 2a serve as a foundation for the stationery supporting device to be more fully described hereinafter. The typewriter is provided with platen raising means which also will be fully described hereinafter, the platen being designated 3 and 35 its usual operating knobs 4.

At the rear of the typewriter carriage 5 there is provided a rod 6 parallel with the platen roller 3, said rod 6 being held removably at each end in extension 1 of plates 34 secured to the type- 40 writer carriage side frames 8. Any suitable means such as a cotter pin 9, (see Fig. 6 also), is utilized to prevent rod 6 from being accidentally displaced longitudinally of the extension 1. A pair of plates I0, II attached to the main 45 framework of the stationery supporting device (generally designated I2), are provided with slots of a diameter slightly greater than that of rod 6,

'and when'the stationery supporting device is to be operatively connected with typewriter I, rod 6 50 is passed through the slots in each of lugs I0, II and secured in extensions 1. Between the respective plates I0, II and suitablestops or collars I3, I4, adjustably secured on rod 6, there are provided coil springs I5, I6, the springs I5, I6 55 being so arranged on rod B that they lie on the outer sides of plates I I), I I, and so oppose each other. It will thus be appreciated that if the typewriter carriage is now moved on its suptwo side plates I2a having the general shape of inverted bridge trusses rigidly joined by a central .stiiening plate I 2b and braced horizontally by are provided,

mounted on brackets 23,

two diagonal intersection braces |2c secured to the upper front corners (Fig.v 1) of the side plates and to the portion of side plates I2@ adjacent the lowercorners of plate |2b. Av front plate or plates I2d rigidly joins th front ends of plates I2a while a horizontal plate |2d joins the upper rear edges of the plates I2a.

The rail I'I.consists of a 'bar mounted behind the typewriter carriage 5, parallel with the platen, by means such as diagonal braces I 'Ia and I'Ib, secured to the ends of rail I I and to the ends of angle strip 2a, and to rail I8, re-

spectively. This leaves a clear space between angle strip 2a and rail II for the plates I 0, II and certain other parts at the front of device I2 to travel with the carriage without interference. If desired, a suitable plate can be substituted for the diagonal braces I'Iav and be provided with a' long rectangular opening to permit the lugs I0, II and parts of the device I2 above and below said lugs to move with the carriage without interference.

'I'wo pairs of rollers 20 are mounted on studs l carried' by the front plate I2d joining the sides of device I2 at the front ends thereof. These rollers engage the top and bottom faces of rail I I and support and guide the front end of device I2 for free movement with the typewriter carriage 5. In order that the device I2 shall be capable of movement along rail |'I without whip or play, two further sets of rollers 2|, 22

engaging the rear and front surfaces, respectively, rail I 'I, rollers 20|, 22 being 24 rigidly secured toA or forming part of the plate Iza onthe from; end of device I2. The track I8 consists of yanj Aangle strip secured to the rear ends of the base strips 2 and supportsy the bulk of the weight of the main framework of device I2 by means of a flanged roller I 8a carried by a stud lmounted on the central-,stiifening plate I2b joining the sides of the device I2.y 'Ihe main framework of device I2 is thus adapted to move transversely upon rails I 1, I8 with everymovement of the typewriter carriage.

Upon the upper surface of the main frame- -work ,of device I2 is carbon sheet stripper carriage generally designated 23a upon which a carbon-strip holder 2l is'mounted for longitudinal sliding movement. This carriage consists of -a substantiallyflat plate having its front and rear edges rolled as at 23b to provide a smooth paper guiding surface and to stiifen the plate transversely of the main framework of device I2. Plate 23a is also provided with longitudinal stiffening ribs 23e. The entire carriage 23a is freely slidable longitudinally of the main frame- -work of device I2 (at right angles to the axis of platen 3)- being provided with rollers 26a engaging the edges of angle strips 24h secured to the'top edges of plates I 2a. The longitudinal movements of carbon carriage 23a are effected having a lug 21a (Figs. 7 and 8) at each end` bent longitudinally of the bar soas to make an angle of approximately with the. plane of the bar. A pair of pins 28, 29 are secured to each lug for the purpose of removably mounting the carbon strip anchoring blades 30. Loops 3| (Fig. 7), formed in a well knownwayin the carbon sheetsI or strips 32, are slipped over the blades 30 (Fig. 7) to anchor the carbon strips in the holder 21. Each blade 30 is provided at one end with two holes adapted to register with one pair of the two pairs of pins 28, 29, and only the perforated portion'of each blade 30 extends beyond the carbon strip for the purpose of mounted on the opposite pair of pins and supports its carbon sheet 32 therebetween. The blades are clamped in place on pins 28, 29 by means of thumb-screws 28a, 29h. 'I'he perforated portion of each blade 30 is twisted at an angle of approximately 45 to the plate of the rest of the strip so that `when the blades are in place on pins 28, 29, although the latter are, as shown, oblique (at an angle of approximately 45 to the horizontal), the carbon-sheet-supporting portion of each blade 30 is parallel with the plane of carriage 23. The effect of the obliquity of pins 28, 29, however, is to cause blades 30 to lie parallel with each other, but in echelon formation when viewed` in cross-section as in Fig. '7. This arrangement venables coincident transverse Acreases 33a in a plurality of superposed sheets or webs 33, each passing between an adjacent pair of blades 30 and hence between an adjacent pair of carbon sheets extending forwardly towards the typewriter from said blades, to reach the blades 30 sequentially and not simultaneously. In this way the frictional grip- .as to cause unwanted binding between the carbon sheetsv 32 and the paper sheets or webs 33.

As is usual in using continuous or fan fold billing machines of the type shown, only a small portion of each carbon sheet is used in typing each form and the worn portions are torn olf from time to time as the transfer materialen the used portions becomes exhausted. After tearing oi the worn portions, the carbon sheets 'must be relocated before a new series of f orms can be typed to compensate for the portions torn oi. In order to permit this relocation of the sheets with a minimum of time and effort means is provided for `moving the carbon sheet holder 21 forwardly in proportion to the length of carbon sheet removed. I'he plate 23a is provided with notches 23d along its longitudinal edges with the notches of one'row in alignment with those of the other row. One endof bar V2'I has a detent block 2lb (Fig. 8) and a plate' 2'IcI 21. 'Ihe opposite end of bar 21 has a similar but somewhatv wider detent block 21d (Fig. 7) having a tooth engaging the notch opposite the one engaged by the detent block 2lb. The detent block 21d is associated with a leaf spring 21e instead of a plate like 21c and the leaf spring is bent downwardly away from detent block 21d and horizontally along bar 21 underneath .plate 23a so as to bear on the adjacent rib 23C,- as shown `block 21h from its notch, leaf spring 21e being so shaped as to permit this last movement. Bar

21 is now moved longitudinally at both ends the approximately desired amount and relocked in place by reversing the procedure just described yto relocate the teeth in the detent blocks in the notches nearest the desired position.

The movements of carriage 23al during carbon stripping operations are limited by means of an adjustable stop 60 consisting of a finger mounted on a rod 6I and to the rod secured by a setsorew. Rod 6l`is mounted in a hole in the upper edge of plate 12b and in a hole in a block 62 secured to rod 63 which is mounted on plates I2a. Finger 60 engages `the rear end of the carriage 23al during the carbon stripping operation and by adjusting the finger longitudinally of the rod 6I, theA device l2 is accommodated to typing on forms of different lengths.

The continuous or fan fold stationery is supported at the rear of the device I2 by a bar 64 secured to the angle strips 24h and curving in transverse section to provide a smooth guiding surface. Side guides are provided consisting of hubs 65 to which are secured guides 66, each comprising a strip bent upwardly (Fig. 2), outwardly away from the longitudinal axis of dej vice l2, upwardly, and then back inwardly a short distance toward said axis by right angle bends. Similar guides 66 are provided at ythe front end of device l2 and are mounted on'al rod 68. The side guides are secured by means of suitable set screws or thumb screws in the hubs and'guide the edges of the superposed sheets or webs of; continuous or fan fold stationery.

Turning now to Figures 3 and 4 of the drawings, which illustrate respectively `the raised and lowered positions of the platen raising device of the present invention, and also to Figure 5 which is a front elevation 'with the platen in typing position, it will be seen that the side plates 34 consist of a vertical sheet metal plate formed with a vertical slot 35, and rigidly joined together at the top by a rod 34a. Adjacent each slot 35 there can ride a frame member 36, guided therein by flanged rollers 36a, and it is in holes in the lower ends of a pair of frame members 36 that the shaft of platen 3 is mounted, instead of being journaled in the typewriter carriage itself as is normally the case. A toggle consisting of two toggle links 31, 38 connects each of frame members 36 with a shaft 4I journaled in the upper `ends of side plates 34, and each toggle is substantially straight when platen 3 is in its' lower or typing position (Figs. 4-and 5). If, with the platen 3 inthis position the toggle 39 be broken, as by pulling forward a handle 40 secured to the shaft 4|, on which shaft are pinned the upper links 31 of the toggles,

then frame members 36, carrying with them the platen 3 are caused to rise. -This movement continues until frame members 36 reach the top of slots 35 in plates 34 as in Fig. 3. In this position ofvv frame members 36, a catch 42, actuated by a spring 42, engages in a vnotch 43 (see Figs. 1, 2 and 5) formed in one of the frame members 36, whereby said members and plate 3 are held in raised position. .f

A cam finger 45 is pivoted at 4 6 on each side plate 34 and has a bent over lug 45a extending behind the side arms of a paper ba'il 41. The latter is pivoted on shaft 4l and tends to rock rearwardly, or clockwise in Figs. 3 and 4 due to springs 41a. anchored to the ar-ms of said bail and to pins 41h secured to rod 34a. Bail 41 extends parallel' with a tearing knife 48 secured to brackets 34h carried by plates 34 above and in front of the platen; The cam fingers 45 each have a straight cam surface 45h above a dwell 45o in which pin 44 rests when the platen roller is in lowered position. When the platen is raised, pins 44 move onto theV cam surfaces 45h thereby rocking fingers l45 clockwise from the position of Fig. 4 to the position of Fig. 3 thereby causing bail 41 to move to a position close to the tearing .knife 48,

When the platen is in its raised or non-typing position, fan fold or other stationery, carbons, or the like may be freely introduced and ar- I ranged beneath the platen and between side plates 34. If now a rm downward pressure be exerted on knobs 4 by the operator, the spring operated catch 42 is forced out from notch 43, and'plate 3 descends into typing position, doubling the stationery below'it as it does so, so that the stationery (not shown) lies around the roller 3 in typing position.` When the platen 3 is lowered, the paper bail 41 is released and permitted, under tension of springs 41a, to bear against the stationery so as to hold the same well away from that sideof the platen 3 which is struck by the type. It is to be remarked that not only do thetoggles 31,38 straighten to the position shown in Figure 4 when platen-roller 3 reaches typing position, but they pass slightly beyond their straight, or true dead-centre position, and are prevented by pinsl 44from being next set of untyped forms. The clamping means consists of a pair of arms 5|,secured to shaft 4l and a clamping'bar 52 secured to said arms. Normally the bar 52 occupies the position of Figs. 4 and 5 directly behind the tearing knife 48, above and in front of the paper bail 41, but, when the platen is raised, arms 5| and v'bar 52 are swung rearwardly and upwardly to the position of Fig. 3 well clear of the typed forms.

The complete operation of the invention will now be described briefly.

Either fan fold forms or separate superposed webs may be used in the machine and may be wound on rolls or arranged in zig-zag folded stacks. Assuming fan fold forms are used, the

the stationery supporting device I2 and the leading edges of the rst forms are drawn forwardly over the guide bar 64, and the carriage 23a, between the side guides 66, 61, vwhich areset to loosely engage and guide the edges of the forms, and underneath the platen which is raised for this purpose. 'Ihe forms are vdrawn forward far enoughv to overlie the paper ball 41 and tearing knife. The carbon blades 30 with the carbon sheets 3 2 anchored thereto are now inserted sidewise between the folds of the fan fold forms, be-

ginning with the carbon sheet and blade -which will normally be at the bottom of the pack, and, placed alternately on the pins 28, 29, inserting the proper spacers 36a as the blades are stacked on the pins. After all the blades are stacked, the

thumb screws 28a, 29a. are turned tight. As each carbon sheet and blade are inserted, the carbon sheet is straightened and smoothed out so as to lie flat between the forms without wrinklingl and the holder 21 is adjusted so that the leading edges of the carbon sheets extend slightly for-` wardly of the point in the first set of forms where the rst line of typing is to be placed. The carbon sheets should fall short of the leading edges of the rst set of forms by at least half an inch. Preferably the forms and interleaved carbon sheets are initially Larranged so that when the platen is lowered and the forms are wrapped around the platen to the extent necessary, the

.previously typed forms can be torn from the next set ofuntyped forms. The stop 60 is now set so that it abuts. the carriage to limit rearward movement and the platen is lowered, as described, by pressing down on the platen knobs 4.

As the-platen descends, arms 5| .and clamping bar 52 swing forwardly toward the tearing knife.

l to draw the leading edges of the first orms clear of the clamping bar 52, whereupon paper bail 41 returns to the position'of Fig. 4 carrying with it the rst forms. The platen ls now turned forwardly'far enough to bring the forms into position for typing the iirst line.

When the typing of each form is finished, the platen is turned forwardly'f-ar enough to bring the finished forms into position to be torn from the untyped forms, the platen is then raised, as described, by pulling forward lever 40. The clampingbar moves backwardly and upwardly to the position of Fig. 3. The operator next pulls the forms forwardly and, by grasping the leading edges ofthe forms, pulls them straight, so that the s-uperposed webs with interleaved carbons lie substantially horizontal, and then, while still holding the forms, by means of handle 26, pushes the carriage 23a. rearwardly against the stop 60. ,This causes the carbon sheets to be drawn back or stripped to a corresponding position with respect to the next set of forms.

i The platen is now lowered, wrapping the forms around the platen, and bar 52 again presses the forrnsv lightly against the tearing bar 41. .The forms now loccupy substantially the same position they had before the'carbon sheets were"-stripped.v7 from the finished forms, except that thesevering Y l,irsogasf/ stack or roll of forms is placed vdirectly behind' line between the nished and unfinished forms now registers with the tearing edge of the knife 48 instead of being held away from the knife by the paper bai-1 41. The finished. forms are now torn from the next set of untyped forms and the 5 platen is then manipulated as before to clear the leading edges of the untyped forms from clamping bar'52 and bring them into 'position for typing the first line. y

When the transfer material onthe active or 10 working portions of the carbon sheets becomes exhausted, it isfde'sirable that the used portions of 'fthe sheets :be severed from the unused portions and that the carbon strip holder 21 be moved for-v 4 Ward on carriage 23a an extent equal to the length c1 torn from each of the carbon'sheets. ,It is usually more convenient to do thisvwhen a set of finished forms is severed. One simple way in which the used portions may be torn is tol raise the platen after a form is completely typed, straighten 20 out the webs, and then, by operating handle 26,

move the carriage 23a rearwardly a distance equal tothe length of carbon sheet to be removed. The platen may now be lowered again and the typed set of forms with the interleaved used portions of the carbon sheets torn from the next set of untyped forms and the unused portions of the carbon sheets,- respectively. With the platen in 4 typing position, the carbon holder 21 is disengaged from carriage 23a inthe fashion described above 30 and replaced on thel carriage, after moving the latter backwardly relative to ,the carbon sheet holder 21 an extent equal to the length of the severedportion of carbon sheet. This leaves the carriage spaced'away'from the stop 60 an extent 35 equal to the amount the leading edges of the carbon sheets should fall short of the leading edges of the forms and with said leading edges coincident. The platen may now be raised again, the

forms straightened, and, by holding the forms but not the carbon sheets, the carriage 23a. may be moved backwardly against the stop 6|.

These operations cause the leading edges of the carbon sheets lto assume the same positions in relation to the first set of untyped forms as originally, but the holder 21 has been moved forwardly relative to the carriage an extent equal to'the length of carbon sheets removed.

The procedure used in removing the used portions of the carbon sheets must'be varied some- 50,

what due tothe layout of the forms used and the location of the typed lines. The procedure de scribed above assumes what might be called an ideal condition where'the typed lines are-quite close together so that the working lengths of the carbon sheets are fairly well exhausted before fit is necessary to bring a fresh portion of the carbon sheets intoworking relation with the forms. In practice this ideal condition, seldom will be found, as in statement and invoice work a name and address may be typed on the top portion of the form, with a group ofitems at the center of the forms, and a total of the items at the bottom. This would exhaust three'denite areas of the working portion of the carbon sheets and in most cases would leave relatively large unused areas between the entries or groups of entries. Under such circumstances, it is more economical to remove only short lengths of carbon sheet at a time and adjust the holder 21 70 forwardly one notch at a time s o that the4 working portions of the carbon sheets are exhausted more uniformly, not only between lines but also between groups of entries.

It may happen that only one ortwo lines'close 75 I together are to be typed near the middle or bottom of a form so that the leading edges of the carbon sheetsinitially fall quite an appreciable distance short of the leading edges of the forms. In this case the used portions of the carbon sheets neednot be removed each time thek carbon sheet hlder 21 is'readjusted to provide fresh working portions but, instead, thev exhausted portions of the carbon sheets can be left unsevered until eventually the leading edgesof the carbon sheets fall a half inch from the leading edges'of the forms and then a relatively large portion of the sheets may be removed at one time. V

The method of adjustably mounting the carbon holder on the carbon sheet stripper carriage has the advantage ofA faciiltating the adjustment of the carbon sheets to provide fresh working portions as it requires only a simple operation to adjust the holder and there are no clamping screws or spring catches to loosen or become accidentally disengaged. In spite of the ease with which the holder 21 may be adjusted relative to carriage 23a, the holder is at all times positively locked against accidental displacement.

It is desirable that the notches 23d in carriage the result that somelines might be printed veryclear and sharp while other might be so faint as to be unreadable. notchesv 23d non-coincident with the line space increments, partly exhausted areas of the carbon sheets will overlap other partly exhausted areas and the carbon sheets will be most economically used.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single embodiment,

it will be understood that various omissions and substitutions and changes in the form and details of the device'illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. AIt is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is as follows:

1. In combination with the frame of a typewriter carriage, a pair of spaced frame extensions, platenv supporting members slidably mounted in said extensions; a pair of toggles, each pair connecting one of the platen supporting members with the frame extensions whereby the bending of said toggles moves said members to vcarry the platen to move from a typing to a non-typing position,- stop means. to permit the toggles to move beyondv a dead center position to thereby lock the platen in typing position, a manually operable member, means actuated by said manually operable member interconnecting the toggles for bending both toggles simultaneously whereby to move the platen to its`nontyping position, a stationery tearing knife, a clamping bar cooperating with said knife, and

means for concurrently moving the clamping bar away from said knife when said lever is operated to move the platen to its non-typing position.

By making the spacing of 2. In combination with the frame of a typewriter carriage, a pairof spaced A,frame extensions, platen members slidably mounted in said extensions; a ypair'of toggles, each connecting one of the platen supporting members with' the frame extensions whereby thebending of said toggles causes the platen to move from a typing to a non-typing position, stop means to permit the toggles to move slightly beyond a dead center position to thereby lock the platenlin typing position, a manually operable lever, means ac- -tuated by said lever and interconnecting the toggles' for bending both toggles simultaneously whereby to move the platen to its non-typing position, a paperbail normally cooperating with the platen inA the path of its movement from a typing to a non-typing position, and means to concurrently move the paper bail out of cooperative relation with the platen and out of its path of movement when said lever is actuated to move the platen from typing to non-typing position.

3.` In a typewriting machine, a carriage frame, I.

a pair of end plates rigidly mounted in said carriage and extending vertically, a carrier slidably mounted in said end plates for vertical movement, a platen rotatably mounted in said carriage; toggle mechanism interconnecting the carrier and the end plates and operative, when the platen is in its -lower or typing position, to lock the n platen against movementto its upper or non-typing position; a manual lever for operating the toggle mechanism to raise the platen to permit work-sheets wrapped around the platen to be stretched out flat in a substantially horizontal position to permit carbon sheets interleaved with the work-sheets to be displaced relative to the ,work-sheets, and detent means for yieldingly retaining the carrier and platen in elevated posi,- tion.

4. In a typewriting machine, a carriage frame,

a pair of upward extensions mounted on said frame, a platen carrier slidably mounted in said4 extensions for vertical movement, a platen rotatably mounted in said carrier, toggle mechanism interconnecting said carrier with said frame and normally operative to lock the carrier in lowered positions to hold the platen in typing position, a manual lever for operating the toggle mechanism to raise the carrier and the platen to a non-typing position to permit forms wrapped around the platen to be stretched out flat in a substantially, horizontal position, a paper bail co-operating with the platen when in its typing position to hold the forms ragainst the platen, and means whereby the movement of the platen to its elevated position moves the paper bail to ineffective position. y

5. In a machine of the class described, the combination with the carriage, a rotatable platen movably mounted inxthe carriage for displace- A 6. In a fanfold billing machine, a platen, a

ing said stationery supporting bar out of co-operation with the platen.

platen supporting frame, means to movably mount the platen in said frame whereby the platen may be displaced from a typing to a nontyping position, means to actuate the platen to a non-typing position and including a toggle arranged to lock the platen in typing position, a

tearing knife disposed in front of the platen in its typing position,.and a paper clamping bar cooperating with said knife when the platen is in its normal position andmovable with the toggle toward and away from said knife.

JOSEPH WILLIAM MILES. 

